Feat/spatial

[Roms1383]

A lousy job.

[Roms1383]

• [x] Register player as ListenerHandle:
  • [x] its position and orientation gets automatically updated with DelayCallback
• [x] Add the ability to register an EntityID as an EmitterHandle:
  • [x] it can be unregistered manually
  • [x] or automatically on Entity/Uninitialize
  • [x] their positions get automatically updated with DelayCallback